Opened 9 years ago

Closed 9 years ago

#777 closed defect (fixed)

Clarification of PCM coding size

Reported by: sasai Owned by: bbross
Priority: minor Milestone:
Component: Text Version: D8 (K0030) v3
Keywords: Cc: bbross, wjhan, jct-vc@…

Description

When both Log2MinCbSizeY and Log2CtbSizeY are equal to 6, PCM coding
can not be used since the variable Log2MaxIpcmCbSizeY has to be equal or less than 5.
In this case, PCM coding can not be used to avoid the bit constraint at LCU level.

Attachments (2)

201201001-ticket777.docx (12.6 KB) - added by kchono 9 years ago.
201201001-ticket777-rev.docx (12.8 KB) - added by kchono 9 years ago.

Download all attachments as: .zip

Change History (7)

comment:1 Changed 9 years ago by DefaultCC Plugin

  • Cc bbross wjhan jct-vc@… added

comment:2 Changed 9 years ago by sasai

More precisely,
at 7.4.2.2 (description for log_2_min_pcm_luma_coding_block_size_minus3)
The text said that
the variable Log2MinIpcmCbSizeY shall be in the range of Log2MinCbSizeY to Min(Log2CtbSizeY,5). However, Log2MinCtbSizeY can be set to 6.

Changed 9 years ago by kchono

comment:3 Changed 9 years ago by kchono

In order to avoid the wrong combination of pcm_enable_flag, log2_min_coding_block_size_minus3, and log2_min_pcm_coding_block_size_minus3 values, perhaps it would be better to describe constraints on log2_min_coding_block_size_minus3 and log2_min_pcm_coding_block_size_minus3 values when pcm_enable_flag is equal to 1.

Attachment describes such constraints.

comment:4 Changed 9 years ago by kchono

I referred to an old version of the current text. JCTVC-K0030-v3 states the constraint on log2_min_coding_block_size_minus3. So the constraint is not needed for log2_min_coding_block_size_minus3.

Attachment describes a revised constraint.

Changed 9 years ago by kchono

comment:5 Changed 9 years ago by bbross

  • Resolution set to fixed
  • Status changed from new to closed

This will be fixed in JCTVC-K1003_v2 with a note in the semantics of pcm_enabled flag.

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  • Benjamin Bross(Owner, Subscriber, Participant)
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  • Woo-Jin Han(Subscriber)